The plane is located in the Jungle, accessible only in Act III. Tracking the quest will lead the player west of the main fishing village of the jungle. Don't confuse the jungle area surrounding the Laboratory with the jungle area near the fishing village where the crashed plane is. Once at the crash site, the quest is completed (you need not approach the plane, simply viewing it from a rock outcrop is enough). In and around the plane are Jungle Muggers, generally wielding semi-automatic pistols and single shot rifles.

While you receive the quest near the beginning of the game, you can not enter the Jungle until later, thus the quest is not completable and will not be displayed in the quest log until such time as it is able to be completed.

It's better to wait to finish this quest until you find the Overpass Camp and accept the quest "Fallen Angel" from Chris. This way, you can finish both quests without having to revisit this location.

It is unknown why this quest is accessible in Act I from the Lighthouse, given that it is only completable past the start of Act III and the probability of survivors existing at the crash site after this amount of time seems unlikely. On the other hand, it's given right after the crash and no one knows how long, if ever, it will take the Hero to locate the wreck. Also, since time doesn't seem to apply in the game (there are no day/night cycles), how long it took to reach the Jungle is debatable. The quest does help tie together the various parts of the game (just like the A Voice from Above the Sky and Spy Game quests).